Stern-Jacobsthal numbers.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =7a(5) =5a(6) =11a(7) =1a(8) =23a(9) =21a(10) =59a(11) =17a(12) =103a(13) =69a(14) =139a(15) =1a(16) =279a(17) =277a(18) =827a(19) =273a(20) =1895a(21) =1349a(22) =2955a(23) =257a(24) =5655a(25) =5141a(26) =14395a(27) =4113a(28) =24679a(29) =16453